Cylinder cup



Nov. l, 1938. c. v. GARDNER CYLINDER CUP Filed Nov. 30, 1935 .nel nl 2::

I N VENTOR.

77? gi/ ATTORNEYS.

Patented Nov. 1, 1938 CYLINDER CUP clarence v. Gardner, perron, M1611., einer to Hydranlic'Brake Company, Detroit, Mich., a corporation of California `Application November 30, 1935, Serial No. 52,391

z claims (l. en -54.6)

'This invention relates to hydraulic brakes. and is particularly concerned with iiuid pressure acutated motors and leak-proof `cups therefor.

Broadly the invention comprehends `a fluid pressure actuated motor including a` cylinder tion elements or shoes I8 and 20; This motor includes a cylinder 32 opened at its respective ends and provided centrally of its length with a port 34 which may be connected to any suitable y iiuid'pressure producing means, not shown. and a piston reciprocable in the cylinder hav- Opposed pistons 36 and 38 reciprocable in the ing on its head a full floating leak-proof cup cylinder 32 have in their respective backs recesses carrying a stop for limiting the movement of the 40 and 42 for the reception of thrust pins I4 and piston. Heretofore .leak-proof cups have been 46 adiustably connected to clevises 48 and 50 fitted on concentric extensions on the'heads ol.' connectedto the respective ends of the shoes 10 pistons, and such structures have' not proved I8 and 26, and sleeved on the thrust pins are generally satisfactory because the cups, due to flexible shields 52 and 5l embracing the open imperfect construction and assembly,`are inhibends of the cylinders so as to preclude dust and I ited from floating to insure perfect centering of` other foreign substances from the cylinder. I the cups on the pistons. The present invention The pistons have upon their respective heads 15 aims to overcome this objection. iloating leak-proof cups 56 held against dislAn object of the invention is to provide a full placement by a spring 66 interposed between the floating leak-proof cup for the piston of a uid cups. Each of the cups includes a. `exibie pressure actuated motor provided .with concenmember having an axial opening 60 and contric lips, the inner lip being arranged to support centric lips 62 and 6I. The lip 62 is of the char- 20 a stop for limiting the movement of the piston, acter of an annular marginal flange and is and the other llp arranged for engagement with adapted to engage the wall of the cylinde1` to the wall of the cylinder to prevent seepage of 'inhibit the seepage of fluid from the cylinder past fluid from the cylinder past the piston. the piston, and the lip 64 is formed on the inner g5 Further objects and advantages of the invenperimeter of the cup defining the opening 60 and 25 tion reside in the various combinations hereinis adapted to embrace a cylindrical stop 66, and after described and claimed as will be apparent the respective stops abut one another when the upon reference to the following specification and pistons 36 and 38 are in fully retracted position. to the drawing, in which.- In a modification of the invention illustrated Fig. 1 is a vertical sectional view of a brake in Fig. 5, a cylinder 68 is suitably secured to a 30 structure embodying the invention; fixed support 1D. This cylinder has a port 12 Fig. 2 is an enlarged longitudinal sectional adjacentits head connected by a fluid pressure view of the fluid pressure actuated motor; delivery pipe 1l 'to a fluid pressure producing f Fig. 3 is a sectional view of the leak-proof means, not shown, and a reciprocable piston 16 Cup; y in the cylinder has a rod 18 extending outwardly 35 I Fig. 4 is a side elevation of the stop; and from the open end of the cylinder and suitably Fig. 5 isa vertical, sectional view of a modiedconnected to the rod is a movable member 80. form of the invention.` A compression spring 82 is sleeved on the rod Referring to the drawing for more specific debetween the back of the piston head and a I tails of the invention, I 0 represents a fixed supretaining ring 8l seated in a circumferential 40 I. I port such as a backing" plate which may be segroove in the open end of the cylinder.

cured to an axle, not shown. and associated with Positioned on the head of the piston is a full the backing plate is a rotatable drum I2 which floating leak-proof cup 86 corresponding to the may be secured to a wheel,`also not shown. leak-proof cup 56, and a cylindrical stop 88 em- The backing plate has thereon spaced anchors braced by the cup seats on the head of the cyl- 45 I4 and I6 on which are pivotally mounted interinder when the piston is in fully retracted posichangeable frlctional elements or shoes I8 and tion. 20, the separable ends of the shoes being conv Although this invention has been described in nected by a retractile spring 22.` Each of the connection with certain specific embodiments,

Shoes includes a' Web u Supporting arim 26 t0 the principles involved are susceptible of numer- -50 which is suitably secured a friction lining 28 ous other applications that win reanuy occur to adaptable for cooperation with the drum. persons skilled in the art. The invention is,

A fluid pressure actuated motor indicated gen-r therefore, t0 be limited only 9,5Z indicated-by the erally at 80 is suitablymounted on the backing scope of the appended claims.

plate I0 between the separable ends of the fric- Having thus described the various features of `155 2 magna the invention, what I claim es new Ind desire to cylinder, n pieton reciproccble therein, scid piston secure by Letters Patent is:- having a nat tace, a nexibic cup associstcd with 1. A flexible cup including nn annular base said face. said cup having en axial opening exhvinl concentric lips and a. cylindrical plug tending entirely therethrough, and a stop for 5 embraced by the bese and the adjacent lip, said said piston embraced within said opening and 5 plug having its base flush with the base of the guided by said cup. cup and a part extending beyond the lips. CLARENCE V. GARDNER.

2. In n hydraulic brake, the combination of n 

